[FFmpeg-trac] #9970(avcodec:reopened): h264_qsv internal bug message on valid h264 video file

[FFmpeg]

#9970: h264_qsv internal bug message on valid h264 video file
------------------------------------+------------------------------------
             Reporter:  jorgev      |                    Owner:  (none)
                 Type:  defect      |                   Status:  reopened
             Priority:  normal      |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  QSV         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+------------------------------------

Old description:

> Summary of the bug:
>
> I've come across a video file which hits a decode error that looks like
> the following:
>
> {{{
> [h264_qsv @ 0x561849930140] Error during QSV decoding.: undefined
> behavior (-16)
> Error while decoding stream #0:0: Internal bug, should not have happened
> }}}
>
> This error does not occur when decoding with libx264 and seems specific
> to running ffmpeg with `-hwaccel qsv`. Running ffmpeg with `-c:v
> h264_qsv` specified instead of hwaccel completes successuflly both when
> compiled with libmfx and libvpl.
>
> How to reproduce:
>
> Download the badfile-shorter.mp4 file and run ffmpeg (built with
> `--enable-libmfx`) like so:
>
> {{{
> % ffmpeg -report -loglevel debug -hwaccel qsv -i badfile-shorter.mp4 -f
> null -
> ...
> [h264_qsv @ 0x55b72b9d4a40] Error during QSV decoding.: undefined
> behavior (-16)
> Error while decoding stream #0:0: Internal bug, should not have happened
> ...
> }}}
>
> I've attached a full log of the ffmpeg output for this error, which
> unfortunately doesn't look very helpful.

New description:

 Summary of the bug:

 I've come across a video file which hits a decode error that looks like
 the following:

 {{{
 [h264_qsv @ 0x561849930140] Error during QSV decoding.: undefined behavior
 (-16)
 Error while decoding stream #0:0: Internal bug, should not have happened
 }}}

 This error does not occur when decoding with libx264 and seems specific to
 running ffmpeg with `-hwaccel qsv`. Running ffmpeg with `-c:v h264_qsv`
 specified instead of hwaccel completes successuflly both when compiled
 with libmfx and libvpl.

 How to reproduce:

 Download the badfile-shorter.mp4 file and run ffmpeg (built with
 `--enable-libmfx`) like so:

 {{{
 % ffmpeg -report -loglevel debug -hwaccel qsv -i badfile-shorter.mp4 -f
 null -
 ...
 [h264_qsv @ 0x55b72b9d4a40] Error during QSV decoding.: undefined behavior
 (-16)
 Error while decoding stream #0:0: Internal bug, should not have happened
 ...
 }}}

 I've attached a full log of the ffmpeg output for this error, which
 unfortunately doesn't look very helpful.

 Some additional pertinent details are:

 Hardware:

 Intel NUC 11
 https://www.intel.com/content/www/us/en/products/sku/205593/intel-nuc-11
 -pro-kit-nuc11tnki3/specifications.html

 OS:

 Ubuntu 20.04 with `linux-oem` installed as well as the driver packages
 provided by intel here:
 https://dgpu-docs.intel.com/installation-guides/ubuntu/ubuntu-focal.html

--
Comment (by jorgev):

 I've added a sample file which reproduces the issue for me
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9970#comment:3>
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